COMPASS H3K4メチルトランスファーゼ触媒モジュールの結晶構造
Peter L Hsu1, Heng Li1, Ho-Tak Lau1
1Department of Pharmacology, University of Washington, Seattle, WA 98195, USA.
Cell
|August 14, 2018
まとめ
研究 者 たち は 酵母 の COMPASS 複合体 の 結晶 構造 を 明らか に し まし た. この構造は,Swd1がサブユニットをどのように組織し,H3K4のメチル化活動を制御する規制ポケットを形成することを明らかにします.
科学分野:
- 分子生物学
- 構造生物学
- 生物化学
背景:
- SET1/MLL酵素ファミリーは,H3K4メチル化による遺伝子転写を調節する重要なヒストンメチルトランスファーゼである.
- これらの酵素は5つのサブユニットからなる共通の触媒コアを共有し,その機能には不可欠ですが,組み立てのメカニズムは不明のままです.
研究 の 目的:
- 無傷の酵母 COMPASS ヒストンメチルトランスフェラーゼ触媒モジュールの結晶構造を決定する.
- COMPASS複合体の組み立てと調節のための構造的基礎を解明する.
主な方法:
- X線結晶学
- タンパク質複合体の構造分析
- 生化学的測定法 (暗示)
主要な成果:
- 5つの亜単位の酵母複合体 (Swd1,Swd3,Bre2,Sdc1,Set1) の結晶構造を決定した.
- Swd1は,他のサブユニットを核化し,触媒部位の近くで調節ポケットを形成します.
- Swd3における新しい酵素調節モチーフとドアストップのようなメカニズムが,基質選択性に影響を及ぼすことが確認された.
結論:
- この研究は,COMPASS複合体の組み立てと調節を理解するための構造的枠組みを提供します.
- この発見は,H3K4メチルトランスフェラーゼファミリーの多様な機能と規制メカニズムについての洞察を提供します.
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